Key to my heart mothers pendant set with larger 3mm. fine natural birthstones. Ideal cut round brilliant diamonds weighing .03 carats total with F color (colorless) and Si2 clarity (flawless to the naked eye). Key is approximately 2 inches long. 14kt weighs 2.1 grams. 18 kt weighs 2.5 grams. Platinum weighs 3.47 grams.